Localization of Folds and Cracks in Thin Metal Films Coated on Flexible Elastomer Foams

• DOI: 10.1002/adma.201300587
• Publication Date: 2013-04-30T09:27:25Z
• Authors: Hugues Vandeparre; Qihan Liu; Ivan R. Minev; Zhigang Suo; Stéphanie P. Lacour
• Keywords: Models, Molecular; Polyurethanes; Electric Conductivity; Molecular Conformation; cellular materials; 02 engineering and technology; flexible electronics; strain; thin films; Elastomers; Gold; 0210 nano-technology; Mechanical Phenomena

Thin metal films coated on soft elastomeric foam substrates exhibit enhanced electromechanical performance. The open-cell structure conveys highly anisotropic mechanical properties within the top, thin capping elastomer at surface of foam. Upon stretching, large strain fields inducing cracks and folds localize above cells, while surrounding cell ligaments remain almost strain-free, enabling stable electrical conduction in metallic coating.